[Qemu-ppc] [PATCH v5 01/10] vl: Don't allow CPU toplogies with partially filled cores

[Bharata B Rao]

Prevent guests from booting with CPU topologies that have partially
filled CPU cores or can result in partially filled CPU cores after
CPU hotplug like

-smp 15,sockets=1,cores=4,threads=4,maxcpus=16 or
-smp 15,sockets=1,cores=4,threads=4,maxcpus=17.

Signed-off-by: Bharata B Rao <address@hidden>
---
 vl.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/vl.c b/vl.c
index 7d993a5..23a1a1e 100644
--- a/vl.c
+++ b/vl.c
@@ -1248,6 +1248,15 @@ static void smp_parse(QemuOpts *opts)
             exit(1);
         }
 
+        if (cpus % threads || max_cpus % threads) {
+            error_report("cpu topology: "
+                         "sockets (%u) cores (%u) threads (%u) with "
+                         "smp_cpus (%u) maxcpus (%u) "
+                         "will result in partially filled cores",
+                         sockets, cores, threads, cpus, max_cpus);
+            exit(1);
+        }
+
         smp_cpus = cpus;
         smp_cores = cores > 0 ? cores : 1;
         smp_threads = threads > 0 ? threads : 1;
-- 
2.1.0